This book is a single-source reference on electromagnetic waves in free space and lightwave communication systems. It presents the fundamental aspects of optical communication techniques that employ wireless radiated and optically guided waves. The text includes applications of electromagnetic waves in the wireless and guided media as well as practical computer models for practice and understanding. It provides extensive discussion of MATLAB®and Simulink®to simulate and illustrate the electromagnetic fields. The chapters describe the materials from the basics to the most modern aspects of electromagnetics for wireless and optical fiber communications.